 |
|
Ultimate Limit State Design According
to the Elastic-Plastic Method for Members |
With the add-on module RF-EL-PL for RFEM, the plastic reserves of the cross-section can be utilized according to the Elastic-Plastic design method as specified in DIN 18800 part 1: The design loadings must not exceed the limit internal forces in the fully plastic state with consideration of the interaction conditions.
Along with the interaction formulae according to DIN 18800, the design methods according to Rubin, Kindmann and Kahlmeyer are available. The design also checks the limit (c/t) ratios according to DIN 18800 part 1, table 15 and considers the respective factors a for compression parts.
Features- Full integration in RFEM with consideration of all relevant internal forces
- Interaction design according to
DIN 18800-1:1990-11: doubly symmetric I-sections
with uni- or biaxial bending - DIN 4420-1:1990-12: pipes
- Rubin: doubly symmetric I- and box sections with uni- or biaxial bending
- Rubin: singly symmetric I-sections with uniaxial bending
- Kahlmeyer: singly and doubly symmetric I- and box sections with uniaxial bending
- Kindmann: all I-sections with uni- or biaxial bending
- Design of section types I, T, QR, RR, RO, CHS, IS, IU, IA, TS, TO, IV, UI, Pipe, Box(A), Box(B), Pi(A), Pi(B), KB, 2I(a=0), 2UR(a=0), 2LA(a=0), ICU, ICO, IBU, IBO, SFBo, SFBu, IFBo, IFBu, ICM, KB(L)
- Freely definable yield strengths, also dependent on structural thickness
- Limitation of moment capacity by factor apl,max
- Cross-section optimization with export option to RFEM
 |
|
|
Input
All relevant RFEM data is preset appropriately in the module. Therefore, the input is reduced to the definition of the relevant members, sets of members and actions. It is also possible to select the structural objects graphically in the RFEM model.
The already preset materials and cross-sections can always be modified. When you adjust materials or sections, you can take advantage of the libraries already used in RFEM. |
|
|
|
|
|
Design
The design is carried out according to the selected approach. If the specific requirements such as section type or bending moments are not fulfilled, the interaction conditions according to Rubin are applied automatically.
The design loading of general cross-sections is determined without considering the interactions as long as the design ratios of the remaining internal forces are below a user-definable value. Likewise, non-designable internal forces can be excluded from the design by specifying a threshold value. |
|
|
|
|
|
Results
The results tables are arranged according to cross-sections, members, sets of members and x-locations. For every designed location, details on the interaction are shown as e.g. full-plastic internal forces, governing (c/t) zone or location of the neutral axis.
The design criteria are visualized on the RFEM model so that you can detect critical structural components immediately. In RFEM, you have access to all tools to evaluate the results graphically, such as the zoom and partial view function, the panel or the print options.
If the design is not fulfilled, it is possible to optimize the cross-section: RF-EL-PL selects the section from the same cross-section row which performs the design with the highest possible ratio. Finally, you can export the optimized sections to RFEM to calculate the internal forces again.
All results tables can be transferred to MS Excel or OpenOffice.org Calc. |
|
|
Note
You can find more information about
RF-EL-PL here:
Download
Download the free demo version of RFEM and its add-on modules.
Request information
Get the detailed product brochure available for download. On request, we send you the brochure including a demo DVD directly by mail.
Selection of members, sets of members and actions
Material properties depending on structural thickness
Optimization request for a cross-section
Design by cross-section with detailed results
Design by x-location with detailed results on (c/t) check
Parts list of designed members
Graphic results in RFEM
